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MODBUS with multi request of reading

Created by: DR75 at: 3/11/2008 6:39 PM (2 Replies)

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3/11/2008 6:39 PM	Rate (0)
DR75 Posts: 4 Rating: (2)	Hi, I try to send 3 requests (function code 3) on the same slave. Master : CP341 Slave : CP341 I use the S7 program available on this forum. I customized it a little bit. The first request always runs perfectly, but for the 2nd and 3rd request, i have got always error bit information from SEND block but no STATUS. So i don't find my error... If i send request one by one (no sequence) all run. Thank you for your help DR75
DR75 Posts: 4 Rating: (2)
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3/14/2008 12:13 PM	Rate (0)
DR75 Posts: 4 Rating: (2)	Hi All, I find the solution of my problem with a help of the CS. See an example (tested) with a CP341 MASTER and a CP341 SLAVE with 3 requests of read. It's a customization of a existingS7 program on this SIEMENS forum (Ethmodbu.zip) Best regards. Attachment MODBUS_300_MULTIREQ.zip (110 Downloads)
DR75 Posts: 4 Rating: (2)
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3/14/2008 4:11 PM	Rate (0)
J_Bell Posts: 5822 Rating: (411)	Hello, thank you for the Project... I guess there will be some people who will be lucky to have it. Best regards J_Bell
J_Bell Posts: 5822 Rating: (411)
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